IPhone 5 won't send MMS messages?

I'm trying to send my friend this funny picture of what I said to Siri on my iPhone 5, and it will not send. I'm on StraightTalk $45 a month, and it does include MMS. I've tried disconnecting from Wi-Fi, etc. And YES my MMS settings are turned on. Please help!

Added (1). Oh, and it says TFW 3G at the top.

Try turning airplane mode on then off. Usually that trick will fix a glitch here n there.

Hard reset… Press the home button and the sleep/wake and hold it until the screen shuts off completely… Then turn it on normally. Don't slide to turn off if it asks you to… Just hold the buttons until its off. MMS should work then and if it doesn't call Apple